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Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]    
Contract assets $ 681,000 $ 851,000
Contract work in progress 287,000 387,000
Advances that are payments on account of contract assets 310,000 574,000
Provision for Loss on Contracts 203,000 371,000
Revenue recognized 755,000 779,000
Contract assets ($244,552 and $294,116 related to VIEs) $ 967,827 $ 1,238,173